Screw-cutting die



Patented Ja 8, 1889.

INVENTOH: 6.83

WITNESSES:

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ATTORNEYS.

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ADOLPH E.

PATENT Erica.

BRION, OF BROOKLYN, NEXV YORK.

SCRi'LW -CUTT'ING DIE.

SPECIFICATION forming part of Letters Patent No. 395,810, dated January8, 1889.

Application filed June 29, 1888. Serial No. 278,552. (No model.)

To all whom it may concern.-

Be it known that I, ADOLPH E. BRION, of Brooklyn, in the county of Kingsand State of New York, have invented a new and Improved Screw-CuttingDie, of which the following is a specification, reference being had tothe annexed d rawings, forming a part thereof, in which Figure 1 a sideelevation of my improved screw-cutting (lie. Fig. is a transversesection taken on line .10 .r, in Fig. 1; and Fig. is a side elevation,partly in section, of a die holder or stock containing my improved die.

Similar letters of reference indicate corresponding parts in all theviews.

My invention relates to the class of screwcutting dies known as soliddies.

The object of my invention is to provide a screw-cutting die having aninternal hardened portion and an exterior portion of soft metal whichcannotbe hardened.

My invention consists in a die formed of a circular blank of steel of aquality suitable for hardening and a rim of low steel or iron whichcannot behardened, the soft rim being attached to the hard interior bywelding.

In carrying out my invention I produce a bar formed of a central core ofhigh steel e11- veloped in a tube of low steel or soft iron, the softenvelope being attached to the high steel by welding, and from the barso made I cut circular blanks, which are drilled, tapped, and otherwisetreated like an ordinary die, the die being provided withclearance-spaces and intervening cutting portions in the usual way.

The high-steel part A is surrounded by a rim, 13, of soft iron or lowsteel, and the center of the part A is provided with cuttingedges a andwith intervening clearancespaces, 7) 1) U The space 73 is continuedthrough the edge of the die, to permit of adjusting the die to therequired size, and the space is continued down to the soft rim 13.

The die thus formed is designed for use in a solid die holder or stock,D, provided with fttljLIShlH -SCFOWS c, by which it may be contracted,and a conical screw, 0, adapted to enter into the space b for thepurpose of expanding the die, the portion of the soft rim l) oppositethe clearance-space Z) being bent in the operation of adjusting the die.The material of the rim B is without temper. Therefore the die retainsits size and form after it is removed from the stock, thus saving thetrouble of readjusting the die.

The principal advantages claimed for my improvement are that the die maybe contracted or expanded without being broken, and it will. retain itssize after adjustment.

IL ving thus described my invention, I claim as new and desire to secureby Letters Patent 1. As an improved article of manufacture, aserew-cutting die consisting in the outer soft iron or low-steel rim,1%, and the central high-steel cutter, A, having cutting-edges a andclearance spaces, substantially as set forth.

2. As an improved article of manufacture, an adjustable screw-cuttingdie consisting in the outer soft iron or low-steel rim, B, and thecentral high-steel cutter, A, having cuttingedges a andclearance-spaces, one of which extends through the cutter and rim,whereby when the die is compressed it will retain its position. byreason of the soft-iron rim, sub stantially as setforth.

ADOLPH E. BRION.

Witnesses:

Gno. M. HOPKINS, EDGAR TATE.

